15555505555 has 8 divisors (see below), whose sum is σ = 18688393152. Its totient is φ = 12429880128.

The previous prime is 15555505519. The next prime is 15555505571. The reversal of 15555505555 is 55550555551.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15555505555 - 2²⁹ = 15018634643 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1810827 + ... + 1819396.

It is an arithmetic number, because the mean of its divisors is an integer number (2336049144).

Almost surely, 2^15555505555 is an apocalyptic number.

15555505555 is a deficient number, since it is larger than the sum of its proper divisors (3132887597).

15555505555 is an equidigital number, since it uses as much as digits as its factorization.

15555505555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3631085.

The product of its (nonzero) digits is 1953125, while the sum is 46.

The spelling of 15555505555 in words is "fifteen billion, five hundred fifty-five million, five hundred five thousand, five hundred fifty-five".